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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
An iron deficiency can lead to the following conditions: 1  Anemia. 2  Chronic fatigue or low energy. 3  Pale or yellowing of the skin. 4  Shortness of breath. 5  Abnormal heartbeats. 6  Signs of a hormone imbalance. 7  Trouble exercising. 8  Muscle weakness. 9  Changes in appetite. 10  Trouble getting good sleep. 11  Changes in weight. 12  Cough.